Apparatus for transmitting and receiving information.



J. L. HALL. I APPARATUS FOR TRANSMITTING AND RECEIVING INFORMATION.

APPLICATION FILED OCT. 6, 1907. 956,960. Patented May 3, 1910.

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956,960. Patented May is, 1910.

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APPLICATION IILENODT. 6, 1907. 3,

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APPARATUS FUN TRANSMITTING AND RECEIVING INFORMATION. APPLICATION FILED 0015, 1907.

956 9 0, Patented May3,1910.

7 SHEETS-SHEET 5.

Witnesses.- myenzori J. L. HALL.

V APPARATUS FOR TRANSMITTING AND REGEIVING INFORMATION. 956,960.

APPLICATION FILED OCT. 5, 1907.

Patented May 3, 1910.

7 SHEETS-SHEET 6.

. \wmc mtnassesx q/W J. L. HALL. APPARATfi FOR TRANSMITTING AND RECEIVING INFORMATION.

Patented May 3, 1910.

APPLICATION FILED 001'. 5, 1907. 956,960.

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UNITE ATS rnn r oration JOHNL HALL, OF SCHENECTADY, NEW YORK, ASSIGNOR' TO GENERAL ELECTRIC COMPANY, CORPORATION OF NEW YORK.

' APZlPAIEtA'I.117$ FOB TRANSMITTING A191) RECEIVING INFORMATION.

7 Specification of Letters Patent.

Patented May 3, 19th.

' Application filed October 5, 1907 Serial No. 396,088.

* ectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Apparatus for Transmitting and Receiving Information, of which the following is a specification.

This invention relates to devices for communicating intelligence from one point to another by means of synchronously-operating electromechanical appliances. It is especially designed for transmitting ranges and deflections from the bridge, conning tower or other station on a war ship to the various gun divisions, and will be herein after described in that connection, though it is obviously much broader in scope.

In order to properly train a gun mounted on a moving vessel so-as to hit another moving vessel, the gunner 'must know not only the range but the amount of deflection to give his piece to compensate for the combined rates of motion of the two ships. For instance, if they are moving in opposite directions, one at twenty knots per hour and the other at fifteen knots, the deflection must be for a total movement of thirty-five knots, and the gunner must fire ahead of the other vessel at an angle corresponding to that speed in order to insure a hit. The sight on the gun is graduated for this purpose,'so

that if the gunner is given the combined speeds or the resultant speed, he can readily set the sight.

By means of my invention, both the range (in yards) and the deflection (in knots) can,

be accurately transmitted to the gunner. At the sending station and at the receiving station are rotatable dials each bearing the ten digits, and also oscillating targets bean ing numbers and letters. Suitable sight holes permit these indicia to be viewed in various combinations. y

In the apparatus hereinafter described; the variation in range is most conveniently made by increments of 50 yards from zero up to 19959. In the case of deflection, the variation may be from 50 knots left to 5G right. The transmitters for range and defiection are separate instruments containing hand-operated shafts which actuate switches controlling electromagnets at the sending and receiving stations connected in multiple so as to operate synchronously. These magnets move the numbered dials, and also the targets, so that both the sending and the receiving ofiicers have a visual indication of theinformation communicated.

In the accompanying drawings, Figure 1 isa front elevation of the range transmitter with the cover removed,-and certain parts shown in section; Fig. 2 shows a portion of the cover; Fig. 3 is a sectional side elevation of the range transmitter, taken on the line 33, Fig. 1; Fig. 4: is a partial sectionon the line 4-4, Fig. l;'Fig. 5 is across section of one of the motors; Fig. 6 is a longitudinal section of the same showing the armature and the coils for polarizing it;

Fig. 7 is an elevation of one of the trains of carrying wheels; Fig. 8 is a plan view thereof; Fig. 9 shows the cam for controlling the ten thousands l target; Fig. 10 isa front elevation of the deflection transmitter, with the cover removed; Fig. 11 is a diagram of circuits in said transmitter; Fig. 12 shows the detent and a portion of the star wheel cooperating therewith; Fig.

13 is a sectional side elevation of the dsiiection transmitter on the line 13-13, Fig. 10; Fig. 14 isa cross section of the tens motor; Fi 15 is a horizontal longitudinal sec. tion 0 the reversing gear; Fig. 16 is a vertical cross section thereof; Fig. 17 is a front elevation of the reversing lever. and

the switch controlling the L ant R target; Fig. 18 shows the manner in which the tumbler for actuating this lever is operated; Fig. 19 is a diagram of the circuits controlling the tens motor in the deflection transmitter; Fig. 20 is a general diagram of the connections between the two transmitters and the receiver; Fig. 21 is a front elevation of the receiver; Fig. is a sectional side elevation 01: the same; and

is a detail ofthe deflection transmitter and Fig. 24 is a development of the entire series of cams in the deflection transmitter.

The range transmitte1t-The mechanical windows 3 3* 3 3 3", tlrough which the range numbers are read. The window 3 gat theright, occupying the units place, is

dummy, and has a zero paintedon it, because the variations in range are by multiples of ten. Behind the tens window 3 is a target 4, carrying the figure 5 and a zero, because the variations in range may for convenience be by increments of fifty. A similar target 5 is arranged behind the ten-thousands window 3, bearing a 1 and a zero, as the indications will not ordinarily reach 20,000. Behind the hundreds window 3 and the thousands window 3 are circular dials6, 7, each bearing the ten stop v11, in which position the figure digits in' regular order, so that by the in tcrmittent rotation of said dials the desired figures can be brought into view through said windows.- Inthis way any number from 00000 up to 19950, varying vby fifties,

canfsbe made to appear. Y

The targets are'arranged in front of the dial'sflso t at the figures on them may be brought conveniently near those on the dials.

Thetar'get 4 is carried by a lever 8, pivoted at 9 and urged by a spring- 10 toward a will be shown. When it is desired to expose the zero instead of the 5 an electromag net 12 is energized, and this attracts an armature 13 secured to the lever and lifts it to the 'position ,shown in Fig. l. The target 5 is carried-by a lever 14, pivoted at 15, andurged by a spring 16 .toward a stop 17. An armature 18 on the leveris attracted by'an electromagnet 19 when the zero on the target is to be exposed.

'The disks 6 7 are mounted respectively.

on shafts 20 suitably journaled in t e frame of the instrument, and adapted to be rotated v r by electric motors. These comprise, preferw' ably, five electromagnets 21, 22, 23, 24,

arranged equidistant in a circle, concentric with the shaft 20, each magnet being made in -two portions with a curved 'pole piece 26 between them, concentric with said shaft. A polarized armature is mounted on the shaft, with its ends'rotating close to said pole pieces 26. This armature is preferably are of the same width as the pole pieces 26,

and each has a central notch 31 of the same width as the space between two adjacent pole pieces. The result is that in any given position of the armature one end will coincide with a lpole' piece, while the other end will be equa y attracted by the two adjacent -zation of the magnets takes place pio- 7'5 .gressively, the armature will be rotated; while if the number of magnets energized on one side of the shaft be alternately one and two, and viceversa onthe other side of the shaft, the armature will move interso mittently half the distance between two magnets ateach step. With five magnets, this gives ten positions of the armature in one revolution, so that at each step anew fi re on the dial will, be broughtin line 5 with the window. In such a progressive energizing of the magnets in groups of three, any given magnet will be of one polarity for three successive positions of the armature, then idle for the next two positions, then of the opposite sign for three successive positions, and then' idle for the next two; these ten-positions completing a single revolution-of the armature. Now, in order to make the proper circuit connections to produce this intermittent rotating 'fiel'd of force, I provide a plurality of contact fingers actuated in proper sequence by a series of rotatable cams mounted on a com mon shaft. As there are two motors, one

' for the hundreds dial and one for the thousands dial, the cams for the two motors are placed on separate shafts, with" means, for causing one to make ten revolutions. to. one revolution of the other. By

,, means of other cams on other shafts, properly geared to the aforesaid shafts, I cause .t-he electromagnets 1 2 and 19 to be energized at the proper times to operate the targets 4 and 5. The preferred construction of this switching device will now be described.

,A solid shaft 32 is journaled transversely in the box 1, and projects through one side thereof, where it is provided with a handle 32. Sleeved on the shaft 32 are the concentric tubular shafts 33,34, 35, each rovided with its handle 33, 34 1-35. he

shaft 35 is a short one and carries just inside the box 1 a single cam 36 having in its periphery a single notch 37. Above said 12d cam is plvoted at 38 a lever 39 provided with a roller 40 which rests on said cam. Below the cam is a similar lever 41 pivoted at 42 and having a roller 43 running in contact-with the cam. The rollers 40, 43 are diametrically opposite, so that only one can enter the notch 37 at any given position of the cam. The lever 39 carries an insulated spring contact finger 44, but the lever 41 is not so equipped. The lever 39 is urged towithan upright bar 49 which is in connecpower circuit. A similar'bar '50 is connectthe finger 44 drops upon the contact 53 and gram Fig; 20, it will be seen that the wind- 1 ings of these electromagnets are all connectemcee ward the cam by a'flat spring 45 attached at i one end to the lever and at the other to a metallic bar 46 which extends across the box 1 and'is supported by the brackets 47. The bar 46 is connected by a strip of metal 48 tion with the positive side of an electric ed with the negative side of the circuit, and is also connected by a strip '51 with a bar 52 running parallel with the bar 46 but below the lever 41. A fiat spring 45 extends from the bar 52 and pressesthe lever 41 against the cam. The contact finger .44 is electrically connected with the bar 46 by means of the flat sprin 45 and the screw shown in Fig. 4 at the eft-hand end of the spring 45 which extends through the insulation which separates the spring 45 and finger 44. By the spring 45 the finger 44 also is urged toward a contact 53 on one end of a stationary contact piece 54 which is connected to one terminal of the electromagnet'12 by means of the screws 55, the contact spring 56, the conducting strip 57 and the contact spring 58. \Vhen the roller 40 rests in the notch 37 of the cam 36, as shown in Fig. 4,

closes the circuit through the magnet coil- 12, thereby lifting the target 4 to the position shown in Fig. 1. When the cam is given a partial .revolution, the roller-40 rides out of the notch, and the circuit of the magnet coilis broken, permitting the spring 10 to 'force the target downward ,and expose 1 the figure 5 By giving the cam a half revolution the lower roller 43 will snap into the notch 37 and hold the cam in this position, so that it cannot shift accidentally.

In order to impart motion from the shaft 35 to the shaft 34, and cause the latter to rotate intermittingly, one-tenth of a revolution at a time, the shaft is provided with a gear wheel 59 meshing with a gear wheel 60 of the same size which is mounted on a short shaft 61 suitably journaled in a support 62. This short sha ft also carries a pin wheel 63, whose single pin 64 is arranged to engage with and actuate .a ten-toothed star wheel 65 secured on the tubular shaft 34, which will thus be caused to make one revolution for every ten revolutions of the shaft 35.

The shaft 34 carries five cams 66 each arranged to actuate a pair of contact fingers 67 68, one finger 67 .being connected with the positive bus bar 46 and the other, 68, with the negative bus bar 52. Each pair of fingers coiiperates with one of the five electromagnets controlling the. hundreds dial 6. Upon referring to the diaed at one end, while their opposite ends lead to conducting strips. In Fig. 3 is shown mounted on but insulated from a lever 70 on which is a roller 71 bearing upon thepe- V riphery of the cam 66.

Each cam has'a cut-away portion 72 extending over an arc of 72 degrees plus'the angular extent of the cam wheel or roller which. drops into such cut-away portion or notch. 01' in other words, the notch in the cam is of sufficient extent to permit the cam to turn through 72 and allow the wheel or roller which cotiperates with' the notch or cut-away portion to remain therein at each end of said arc of 72 with its center coinciding with the radial line which denotes the termination of the said are. It, therefore, follows that during three successive positions of the cam one of the contact fingers, say 68, may. remain closed upon the contact 69, giving the magnet a certain polarity.

.During the next two positions of the cam both fingers will beofi' the contact 69. During the next three positions the finger 67 will be closed on the contact 69, giving the magnet the opposite polarity, and during the two final positions (in any one revolution) both fingers will be off the contact 69. This se-' quence of circuit control insures the proper actuation of the polarized armature, as herejinafter set forth.

4 In order to enable the magnets to be energized in groups of three in proper order, the cams are so disposed on the shaft that the cut-away portion of each one is angularly displaced 72 degrees in advance of its,

predecessor. A single revolution of the shaft 34 will thus produce a single stepbystep revolution of the dial 6, bringing the figures thereon into view through the window 3 in regularorder. The shaft 34 is geared to the shaft 33 by a train of gears, pin wheel and star wheel exactly similar to the train which connects the shafts 35 and 34.; The shaft 33 carries a set of cams 73 similar to the cains...66, and operating in the same way to control the circuits of the electromagnets which operate the thousands dial 7. A similar train of gears, pin wheel and star wheel connects the shaft 33 with the notches 75, with which cooperates a lever 76 carrying an insulated contact finger. When this finger drops upon the proper contact it closes the circuit through the magnet coil 19 and actuates the target 5. If, then, the cam is rotated intermittingly, moving one-tel ll of a revolution at each step, the magnet Ct it will be alternately energized and de'e'nergized and will shift the target 5 ten times during one revolution of and cam; making it read alternately 1 and zero. The dials and targets may all be returned to zero by rotating the shafts backward by means of I their handles, which are suitably graduated 5 to indicate the zero position.

The deflection transmittefl-The mechan-.

ical construction of this is shown in Figs. to.19, inclusive. The instrument is designed to indicate and transmit deflections 1o varying from a maximum of 50 knots left 77 is operated by a polarized armature motor similar to those Which'operate the dials 6 and 7. The dial 78 is operated by the motor shown. in Fig. 14, 'having'three pole pieces 84 spaced 120 de recs apart, oooperating with a polarize armature 85 whose face is the same in length as a pole piece, and has a. notch equal in width to the space between the pole pieces. Forconvenience in manufacture, tw'osmall electromagnets are connected to each pole piece instead of a singlelarger coil. Byso connecting the electromagnets that one pole piece will be of one polarity and the other two of the opposite polarity, the armature will assume a position like that shown in Fig. 14, and by varyin'g the grouping of the three pole pieces the armature will be rotated intermittingly, one-sixth of a revolu- .tion at each step. 40 The terminals at one end of thecoils in each motor are connected in star, while those at the other end are each connected through leads 8(3, 87, 88, 89 with twostuds 90, 90 insulated from their supporting bar 91. Gooperating with each stu is a contact finger 92, 92 insulated from its supportingle'ver "93 which is pivoted at 94 and has a roller 95 bearing against the periphery of a'cam:

The contact fingers are urged towardthe studs by spring presser fingers 96,96 which also serve to convey current to said cont-act fingers] The presser fingers 96 are mounted on insulated metal'supports 97 which are connected with the positive main of a supply circuit, while the presser fingers 96 are supported by plates 97 which .are in circuit with the negative main. actuate the levers 93 are so'designed that either one contact finger 92 or the other 92 can be put in circuit with the lead going to any particular coil, but not both at the same timmmzI-f finger 92-isin contact with I its stud 90 the lead will be connected to the positive main and the pole piece of the corresponding coil will be given, say, a north The cams which polarity; while if finger 92 is on"its stud 90, the opposite polarity will be produced. The cams which actuate the contact fingers are all mounted on a shaft 98 which is'journaled in brackets 99 suitably supported in a box 100 adjacent to the dials 77, 78 and their motors. The shaft is operated by a handle 101 attached to the outer end of a short shaft 102 which projects through the front of the box at right angles to the shaft 98. On theinner end of the short shaft is a bevel pinion 103 which meshes with two oppositely-faced bevel gears 10%, 105 journaled to turn freely on the shaft 98. By means of. a suitable clutch either one or the other of said gears can be clutched to the shaft 98,.so that a continued rotation of the shaft 102 can be caused to rotate the shaft 98 in either direction. The object of this is to enable the operator to start at a deflection of, say, 50 L and proceed down to zero and from that up to 50 R without reversing the direction of rotation of the handle. The dials 77, 78, however, must rotate in one direction from 50 L to zero and in the reverse direction from 'zero to 50 R. In other words, the shaft 98 must be reversed in rotation at the zero point in the scale, and this must be done auto1natically-without reversin' the actuating shaft 102. The preferre mechanism for accomplishin this will now be described. The two beve gears are provided with clutch teeth 106 to mesh with similar teeth on a sleeve 107 splined on the shaft 98 be tween said gears. A forked shifting lever 1 108 engages a groove in said sleeve," and is pivoted on a stud 109 projecting from theback of the box between said gears. The lever is actuated by a T-sha ed tumbler 110 pivoted-at the angl of the r on a stud 111 projecting from th back of the box radially to the shaft 98. The stemof the tumbler carries a wrist pm 112 engaging with a slot .in the-lever 108 so that whenthe tumbler is turned it will move the lever and thereby shift the clutch sleeve from engagement with one wheel into engagement with the other.- The tumbler is moved Joy means of notches 113 in rings 114 secured to-the gears.,115 The tumbler lies between these rings, and as its T-head is lo'nger than the space between said rings, it stands normally at an angle thereto, as shown in Fig. 18. The notches I 113 are so located that by the opposite rotationof the gear wheels said notches will come opposite each other ...t the instant the zero .point is indicated by the deflection dials 77, 78. Springs 115 on the sides of;

the lever constantly urge thet'uinbler toward its midway position, as shown in Fig. 17, and when the notches approach their meeting point, the friction rollers 116 on the ends of the tumbler head are engaged thereby, so that as the notches pass they turn the tumbler. After the notches have drawn away from the tumbler, the latter remains locked between the rings until the gears are reversed arid the notches meet again. The tumbler is 'pivotally connected to a switch lever 117 which controls the circuit of the electro-magnet 82 operating the target 79, so that when the tumbler shifts at the zero point in theindicationathe target shiftsalsoto change the letter from L to it, or vice versa, as the case maybe.

As the dial 7 8 must occupy six different positions, and the dial 77 must occupy ten positionsfor each one of five of the figures shown by the dial 78, plus one for the fig ure 5 thereon, the" shaft 98 must make fifty successive steps in one direction of revolution starting at 00. To insure accuracy of osition and prevent the parts from bein garred out of position by n fire or other s ocks, a detent. is rovide preferablya spring-actuated pl iinger 118 cooperating with notches in a star wheel 119 secured to the shaft 98, preferably by means of studs 120 projecting from one side of a cam. Said star wheel contains sixty notches in its entire periphery, though only fiftyone of these are used in the operation of the transmitter.

In order to arrest the rotation of the shaft 98 when the dial's show the number 50, a suitable stop is provided. This consists preferably of two dogs 121 each pivoted at one end and having its nose en gaging with a screw-thread cut in the outer surface of a bevel gear; there being one dog for each gear. At the proper point in this screw-thread is inserted a pin 122 which strikes against the dog when the shaft has turned the roper number of degrees. As the forwar rotation of the shaft from 50L to the zero point of the dials and its subsequent reverse rotation to 50B is effected by a constant rotation of the handle in one direction, it follows that the gear wheels each rotate through twice as many degrees as the shaft. This explains the necessity for the screw'thr'eads, which swing the dogs out of the paths of the pins-and permit them to pass at the middle of their travel. Since the pins prevent the completion of the second revolution of the gear wheels, the shaft must therefore turn through less than V a complete revolution. For example, let it be assumed that the angular movement of the shaft is 325 degrees. This means that in each cam therewlll be an idle sector covering 35 degrees. Since'there are live electromagnets in the niotor operating the dial 7 7, and each electromagnet has its connecting lead provided with a positive branch and a negative branch, it requires ten came to effect the circuitconnections for this motor. For the same reason, six cams are necessary to produce the proper groupings of the three electromagnetsin the motor which effects the five changes in the dial 78. The cams 123 which control the contact fingers for the dial 77 are of a different configuration from the cams 124 which control the dial 78.

It has been stated that in each cam there is an idle sector covering 35 degrees of thecircumference. The cams 123 must produce five revolutions of the dial 77, that is to say, they must repeat the circuit connections for all the ten digits five times, and then repeat the connections for zero once more. The remaining 325 degrees on each cam is therefore divided into five equal sectors of degrees each, andeach sector is' suitably 80 notched to cause the proper circuit connec-' tions. It will be found that the first cam as shown inFig. 23 (reading from left to. right) has two notches, each covering six and a half degrees of are (or one step) with an interval of" 35 degrees between them, and also four notches, each covering .13 degrees'of are (two steps) with intervals of 52 degrees between themselves and between them and the other two notches. The

remaining nine cams each have fiven'ofiches,

each covering 13 degrees of arc with four intervals of 52 degrees and one interval of 87 degrees. The eighthand ninth cams have, also an additional notch corresponding with a single position and located respectively at opposite ends of,the idle sector. Fig. 13 shows the fourth cam, the idle sector being indicated in dotted lines. In the actual embodiment of the apparatus each cut-away portion or notch is, of course,'lengthened at each end beyond the number of degrees stated by an amount equal to the angular extent of the circular cam Wheel or roller 95 which drops into said notch, so that when said roller rests at the endof a notch its center will coincide with the radial line intersecting the theoretical end of the notch.

The cams 124: whichcontrol the dial 78 are all shown in Fig. 19, the various sectors being indicated by dotted lines. These cams make only six circuit changes, but each arrangement of connections must be ,maintained during the changes of the dial 77. Inasmuch as all the cams on the shaft 98 rotate at the same peripheralspeed, the depressions on the cams 124 must be long enough to allow for suflicient angular movement of the cams 123 'to complete a-retation of the units dial 77 before shifting the 12s tens dial 78.

Fig. 24 shows a development of all of the sixteen cams which operate the deflection transmitter. At the left-hand side of the figure is a scale of degrees showing that 125 there is an idle sector cov ring 35 degrees and that the notches occup the remaining 5 325 degrees. In this figure no allowance is made for the width of the roller, the notches being made to coincide with the radii" de-* noting. the exact number of degrees stated in the specification as being covered by each notch.

Both sets ofcams are keyed on the shaft in such positions that they operate the 'contact fingers in a predetermined order. The first three cams 124 at the left in Figs. 10 and 19 control the three positive fingers for the three pole piecesofthe motor for the dial 78. The next three cams 124 reading from the left, control the negative contact fingers for the same motor. The next five cams 123 '(Fig. 10) control the positive contact-fingers for the. motor operating the dial 'spectively.

7 7, and the last five cams 123, the negative" fingers for-said motor.

The range and deflection indicaton-At each of the several 'gun stations is located a receiver comprising a combined rang /and deflection indicator, which is shown inffront and side elevation in Figs. 21 and 22,112

The receiver consists of" duplicates of the dials and targets and their motors and electromagnets similar in.,every releads 125 from the mains 126 enter a junction box 127 from which threeuzables are taken out, one of 7 them, 128, containing one posltlve and ,one negative wire, and twelve connecting wires, all running to the range connecting wires. 'The'third cable, 130, runs to the receiver, and contains duplicates'of 3 all the connectin wires, besides a positive and-negative con uctor; twenty-three in all. What I claim as new and desire to secure 'by Letters Patent of the United States, is,-

1. In an apparatus forsending and receivlng information, a transmitter comprising two or more movable members bearing indicia, electromagnetic means for moving predetermined order.

2. In an apparatus for sending and. receiving information, a transmitter comprising one or more rotatable dials and osci1la tory targets, both bearing indicia, electromaignetic means for operating said dials an targets, a plurality of switches controlling said means, and a plurality of rotatable cams for actuating said switches in a predetermined order.

3. In an apparatus for sending and receivmgmformation, a transm1tter comprisapart, and a polarized armature having inga rotatable dial and an oscillatory target, both bearing indicia, individual electromagnetic means for operating said dial and target, and a plurality'of switches control lin said means and'arranged tocause an oscillation of said target at the completion of a predetermined movement or said dial.

11 an apparatus for sending and re' ceiving information, a transmitter comprising airotatable dial, and means for rotating said dial comprising a plurality of electroma etsiconnected. in parallel and having "their pole pieces spaced at equal distances bifurcated ends adapted to span the space between .two pole pieces. 5. In an apparatus for sending and 'receiving information, a transmitter comprising a rotatable dial, and means for rotating said dial. a certain number of equal angular movements comprising a set of field electromagnets in number equal to one-half0f said movements, and a polarized armature havin each pole of the same Width as a field po le piece and containing a notch equal in width to the space between two field pole pieces.

6. In an apparatus for sending and-receiving information, a transmitter comprising a rotatable dial, and means for rotating said dial a certain number of equal angular movements comprising a set of field electromagnets in nu'm er equal to one-half of said movements, a polarized armature having each pole of the same Width as a field pole piece and containing a notch equal in width to the space between two field pole pieces,

"andaneans for energizing. said field'magnets in groups, a portion of each group coiiper ating with one pole of the armature and the rest with the other pole.

7. In an apparatus for sending andreceivin information, a plurality of circuitcontro ling elements, a shaft carrying the same, two bevel gears sleeved on said shaft, means for rotating them in opposite directions, a clutch for connectin 'one or the other to said shaft, and means For automatically shifting said clutch at the end of a pre determined angular movement of said shaft in either direction.

8. In an apparatus for sending and, receiving information, a plurality of circuitcontrolling elements, a shaft carrying the same, two bevel gears sleeved on said shaft, means for rotating them in opposite directions, a clutch for connecting one or the other to said shaft, a device for shifting said clutch, and means carried by said gear Wheels for actuating said device.

9. In an apparatus for.sending'and receiving information, a plurality of circuitcontrolling elements, a shaft carrying he same, two bevel gears sleeved on said shaft,

means for rotating them in opposite direc:

-' tions, a clutch for connectin -.one or the other to said shaft, a lever for shi ingsaid clutch,

and tappets on, said gear. wheels for actuatlng said'leveri f r 10. In anapperetus for sending and receivin informetiomfa plurality ofcircuit-- contro ling; element's, at shaft carrying the same-two bevel means for rotating "them. in opposite: direcactuating -said 1ever,;said"t eiifing' intormatiomthe gears sleeved 011' said shaft,

tions, 'ajclutchgfor connecting one or the other tOnSflid shaft, a." lever forjshiftmg'said for epp'ets consisting if said gears.

clutch, and tappets onsaid gear whee of notchecf ceri'i lit-J11" iin' appdrtujs;

vends ofr jsaid tumbler to 100 oiisending and recembination with e switch-operating shaft, of two bevel gears sleeved thereon, means for rotating them in opposite directions, a clutch for connecting one or the other to said shaft, 'a T- shaped tumlileradapted to shift said clutch, and rings on said gears en aging with the said rin s having notches which engage with and shit "said tumbler as theypass each other. o

In witness whereof, I have hereunto set my handthis-th day of October, 1907.

JOHNLHALL. I Witnesses:

BnNJAMiN IBZHUnn,

HELEN Onrono.

it in position, 

